Abstract
DNA was isolated from macronuclei and micronuclei of the ciliated protozoan, Stylonychia mytilus under conditions that minimize the possibility of DNA degradation. Macronuclear DNA has an S value of 10 to 11 in sucrose gradients. Macronuclear DNA has an average molecular weight of 1.15×106 daltons and a range of molecular weights of 1.0×106 to 1.95×106 daltons. The average length of macronuclear DNA, measured by electron microscopy, is 0.80 microns and the range is 0.2 to 2.2 microns. Almost all micronuclear DNA pieces are too long to be measured by electron microscopy. The shortest piece of micronuclear DNA found was 15.0 microns in length.
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Ammermann, D.: Cytologische und genetische Untersuchungen an dem Ciliaten Stylonychia mytilus Ehrenberg. Arch. Protistenk. 108, 109–152 (1965)
—: Synthese und Abbau der Nucleins: auren während der Entwicklung des Makronukleus von Stylonychia mytilus (Protozoa, Ciliata). Chromosoma (Berl.) 25, 107–120 (1968).
—: Release of DNA breakdown products into the culture medium of Stylonychia mytilus exconjugants (Protozoa, Ciliata) during the destruction of the polytene chromosomes. J. Cell Biol. 40, 576–581 (1969).
Eigner, J., Schildkraut, C., Doty, P.: Concentration effects in the hydrodynamic properties of deoxyribonucleic acid. Biochim. biophys. Acta (Amst.) 55, 13–21 (1962).
Eigner, J., Doty, P.: The native, denatured and renatured states of deoxyribonucleic acid. J. molec. Biol. 12, 549–480 (1965).
Kirby, K. S.: Isolation and characterization of ribosomal ribonucleic acid. Biochem. J. 96, 266–269 (1965).
Kleinschmidt, A. K., Lang, D., Zahn, R. K.: Darstellung molekularer Fäden von Desoxyribonucleinsäuren. Naturwissenschaften 47, 16 (1960).
Kloetzel, J. A.: Compartmentalization of the developing macronucleus following conjugation in Stylonychia and Euplotes. J. Cell Biol. 47, 395–407 (1970).
Lezzi, M.: Die Wirkung von DNase auf isolierte Polytän-Chromosomen. Exp. Cell Res. 39, 289–292 (1965).
Løvtrup-Rein, H., McEwen, B. S.: Isolation and fractionation of rat brain nuclei. J. Cell Biol. 30, 405–415 (1966).
Prescott, D. M.: Structure and replication of eukaryotic chromosomes. In: Advanc. Cell Biology, 1 (D. M. Prescott, L. Goldstein, E. McConkey, eds.), p. 57–117. New York: Appleton-Century-Crofts 1970.
- Bostock, C., Gamow, E., Lauth, M.: Characterization of rapidly labeled RNA in Tetrahymena pyriformis. Exp. Cell Res., in press (1971).
- Carrier, R. F.: Experimental procedures and culture methods for Euplotes eurystomus and Amoeba proteus. In: Methods in cell physiology, 1 (D. M. Prescott, ed.), p. 85–95. New York: Academic Press 1964.
Rao, M. V. N.: Macronuolear development in Euplotes woodruffi following conjugation. Exp. Cell Res. 49, 411–419 (1968).
- Ammermann, D.: Studies on the polytene chromosomes in the macronuclear development of Euplotes woodruffi. J. Cell Biol. 43, 110a (1969).
Studier, P. W.: Sedimentation studies of the size and shape of DNA. J. molec. Biol. 11, 373–390 (1965).
Svedberg, T., Pedersen, K. O.: The ultracentrifuge. Oxford: Clarendon Press. 1940.
Wolstenholme, D. R., Dawid, I. B., Ristow, H.: An electron microscope study of DNA molecules from Chironomus tentans and Chironomus thummi. Genetics 60, 759–770 (1968).
Yasmineh, W. G., Yunis, J. J.: Localization of mouse satellite DNA in constitutive heterochromatin. Exp. Cell Res. 59, 69–75 (1970).
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Prescott, D.M., Bostock, C.J., Murti, K.G. et al. DNA of ciliated protozoa. Chromosoma 34, 355–366 (1971). https://doi.org/10.1007/BF00326311
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DOI: https://doi.org/10.1007/BF00326311